Rotating magnet



April 5, 1932.' T. BUCHHOLD 1,852,232 ROTATING MAGNET l Filed July 14. 1930 Inventor Y Theodor Budrhold By Q Patented Apr. 5, 1932 UNITED STATES PATENT OFFICE ROTATING MAGNET Application led July 14, 1930, Serial No. 467,681, and in Germany July 15, 1929.

This invention relates to improvement-s in electro-magnets and particularly to magnets having a rotatable portion capable of pro-y ducing a relatively high torque at small angular displacements.

f Rotating magnets heretofore did not produce a sufficiently great and positive torque in the small angles of rotation -to permit yuse thereof, as operating devices, for which certainty in operation isv a requisite. The torque of such rotating magnetsgenerally decreases proportionately as the angle of rotation decreases and, ofttimes, it was found that the decrease was Yso rapidas to prevent the use of rotating magnets, particularly when only a small path of movement of the device to b e operated was desirable.

It is, therefore, amongvthe objects of the present invention to provide a rotating niagnet of suitable construction which will produce a high torque, particularly over and independently of small angular movement.

Another object of the invention is to provide a multi-pole rotating electro-magnet in which the magnetic iiux will'be greatly increased and distributed substantially equally to the several poles of coremembers carry-- ing the coils and the poles of an armature surrounding the core and the-coils.

3o Objects and'advantages, other than those above set forth, will be apparentv from the following description when read in connection with the drawings, in which Figure 1 is a cross-sectional view on 'a plane at right angles to the axis of a structure embodying the present invention;

Fig. 2 is a cross-sectional view of the structure shown in Fig. l on a plane parallel to the axis thereof and. at right angles to the view shown in Fig. 1; V

Fig. 3 is a view, similar to that shown in Fig. 1, of a modified form of the invention, Fig. 4 is a view, similar to that shown in Fig. 2, of the modified embodiment of the invention shown in Fig. 3.

Referring more particularly ings by characters of reference, the reference numerals 6 and 6 designate, generally, cores or core members which are each mounted on .ranged concentrically about the to the draw- I and afixed to a shaft 7 ixedly supported by a support or pedestal 8. The core member 6 is shown as formed with a hubportion 9 having a plurality of angled poles 11 and and thev core member 6 has a plurality of 55 angled poles 11 extending therefrom in such manner asto extend over and substantially enclose a plurality of coils 12 and 18 arhub 9..

The armature of the magnet is formed from two disks 14 and let', preferably of non-magnetic material, rotatably mounted on the shaft 7 and interconnected by a plurality of pole pieces 16. The armature carries an extension 17 to which may be connected a 65 rod or other connecting means 18 leading to a device to be operated. When the magnet is constructed to rotate the armature in a clockwise direction, a spring 19 is secured to the extension to return the armature to I0 the initial position as shown in the drawings.

'If the armature poles 16 are formed with off-set ends 20, as shown in Fig. 1, andthe core poles are made with corresponding complementary ends 22, the tractive forces are greatly increased, the closer they poles move into contact and vice versa. The embodiment of the invention as shown in Fig. 2, differs from the embodiment shown in Fig. 1 in that in the embodiment of Fig. 2 the .poles 80 l1 and 11 are spaced from each other in the circumferential direction and are materially wider in the axial direction 'than those shown in Fig. 1. L.

It will be seen by referring to the drawings 35 that the density of the lines of force, shown in lines 21, are greatly increased. In the embodiment in Fig. 1, the flux flows from the core 6 through the pole 11', the air gap between the core pole 11 and the armature. pole 16, through the pole 16, the air gap, the core pole 11, the core 6, and back to the core 6. In the structure shown in Fig. `2, the flux flow may be readily seen and the path thereof is accordingly not specifically set forth. The result of such ux flow is that, ifv the armature is immovable, the coil will move in a counter-clockwise direction` and, vice versa, that if thecoil is immovable, the armature will move in a clockwise direction, proare fixed.

2 f v y 1,852,232

" described, itV will be apparent vto those skilled in the art.that various changes and modifications ma bemade therein without departing from t e spirit of the invention or from the scope of the appended claims.

The invention claimed is: 1. In a rotating electro-magnet, a supporting member, a shaft alixed to said member,

y a core member having a fplurality of poles l t arranged upon said sha a magnetizing coil arranged upon said core member, a multipolar armature rotatably arranged adjacent thecore member, a-nd means for returning said armature to the initial position after rotation thereof.

2. Inca rotating electro-magnet, aT supporting member, ^a shaft member, la core member -havin a plurality of poles arranged upon said s aft, a magnetizing coil arranged upon said core member, a multi-polarfarmature rotatably arranged about the core member, the poles of said core member correspondin in number to the oles of said armature an being closely adjacent thereto, and means for returning said armature to the initial position after rotation thereof.

3. In arotating electro-magnet, a shaft,

-means for' supporting said shaft against movement, a plurality of core members af-l fixed to said shaft, each' of said members having a plurality of poles, said core memthe poles thereof extend in alternate directions,r a plurality of magnetizing coils arrangedv upon said core members and substantially inclosed by the poles thereof, a multiaffixed to said bers `being so arranged on said shaft that' 'turning said armature to the initial position after rotation thereof.

5. In a rotating electro-magnet, a shaft, means for supporting said shaft against movement, a plurality of core members each havin a like number of poles iixedly arran e a p urality of magnetizing coils arranged upon said core members, an armature comprising discs rotatablymounted upon said on said shaft in interleaved relation,

shaft and pole members interconnectingsaid discs, said armature substantially inc sing said core members and said coils, and means for returning said armature to the initial position after rotation thereof.

v 6. In' a rotating .electro-ma et a shaft, means for 'supporting said s aft against movement, a plurality of core members each having a' plurality of poles, said core members being affixed to and so arranged on said ,shaft that the poles of the several members extend in alternate directions, a plurality of magnetizing coils arranged upon said core members in concentric relation therewith and substantially enclosed by the poles thereof, an armature comprising discs of non-magnetic material and pole members interconnecting said discs rotatably mounted on said shaft in such manner, as tol substantially enclose said core-members and said coils, and means for returning said armature to the initial position after rotation thereof.

In testimony whereof I have hereunto subscribed my name this 2nd day of July, A. D.

THEODOR BUCHHOLD.

' `lois polar armature rotatably .arranged about the I core members, and means for returning said armature to the initial position after rota#y tion thereof.

4. In a rotating electro-magnet, a shaft, means for supporting said shaft against movement, a -plurality of core members each having a like number of poles iiedly arranged on said shaft in interleavedrelation, af'plurality of magnetizing coils arranged concentrically upon said core members and substantially inclosed by the poles thereof,

a multi-polar armature rotatably arrangedV about said core members, and means for reius4 izo 

